st: Use varlabel in expressions

[Marcelo Lafleur <lafleurm@un.org>]

I've had not luck with this and all references in this list point to use 
of value labels. 

My question is simple: How, if possible, to drop variables based on a 
prefix in their varlabels?

Examples:

. des  mv218 mv225 mv245 mv246

variable name       value label      variable label
----------------------------------------------------------------------------
mv218                                           number of living children
mv225                  mv225            na-current pregnancy wanted
mv245                                           women fathered children 
with
mv246                   mv246           na-married to mother when first 
child was born

(I edited the output a bit)


I want to drop mv225 and mv246 by testing that the variable label starts 
with "na-"

Having hundreds of variables in each dataset, it would be impractical to 
do by hand.

Any ideas?

Marcelo
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